Brexit campaigner Michael Gove also refused to associate himself with Mr Farage’s comments.

The Justice Secretary told ITV’s Peston on Sunday: “He’s made those remarks and I haven’t made remarks like that and I won’t make remarks like that.”

Mr Farage made headlines during the general election campaign last year when, during a TV debate, he claimed the cost of drugs for foreign HIV patients should instead be spent on cancer drugs for deserving Britons.

“The nuclear bomb this time would be about Cologne,” he told the Sunday Telegraph.

In January, reports emerged of allegations that hundreds of women were groped, robbed and intimated at the German city’s central station on New Year’s Eve.